Screening apparatus.



Patented Nov. 20, I900. T. R. JORDAN.

SCREENING APPARATUS.

(Application filed June 8, 1900.)

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N0. 66l,996. Patented Nov. 20, I900.- T. R. JORDAN.

SCREENING APPARATUS.

(Application fllad June 8, 1900.)

(No Model.) 3 Sheets-Shaat 2.

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No. 66|,996. v Pa'tented Nov. 20, I900.

T. B. JORDAN.

SCREENING APPARATUS.

(Application filed June 8, 1900.) (No Model.) '3 Sheets-Sheet 3 I Tho/n00 fiowl m d n W1 T/VESSES; f6. %@Z@ X6. ZQQMM M.

THOMAS ROWVLANI) JORDAN, OF NEW YORK, N. Y., ASSIGNOR TO THE JORDAN GRAVITATION PROCESS COMPANY, OF NEW YORK.

SCREENING APPARATUS.

SPECIFICATION forming part of Letters Patent No. 661,996, dated November 20, 1900.

Application filed June 8, 1900. Serial No. 19,5 '78. \NO model.)

To all whom it may concern:

Be it known that I, THOMAS ROWLAND J on- DAN, a subject of the Queen of Great Britain, residing at 325 Amsterdam avenue,New York, in the county of New York and State of New York, have invented certain new and useful Improvements in Screening Apparatus; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being bad to the accompanying drawings, and to the letters of reference marked thereon, which form a part of this specification.

My present invention relates to improvements in apparatus for-grading materials, and contemplates the production of an appliance of this character which is adapted for sizing and feeding automatically to other apparatus or machines pulverulent materials, the appliance being designed more especially for use in the sizing and feeding of materials containing particles for concentration.

The object of my invention is the construction of a simple apparatus of high efliciency and large capacity which is capable of adjustment to exactly suit the varying specific gravity and size of the particles to be treated and which will require for its operation but little power and will. be perfectly automatic in its action.

The details of construction and operation of my improved apparatus will be found to be fully and clearly set forth in the following description andillustrated in the accompanying drawings, in which- Figure l is an end elevation of my i m proved sizing and feeding apparatus, two of the apparatus being shown to illustrate the preferred arrangement whereby the material from one discharges into the other. Fig. 2 is a vertical longitudinal sectional view of the apparatus; Fig. 3 is an enlarged cross-sectional view, partly broken away, showing the brush and dischargenozzles. Fig. 4c is a further enlarged sectional view of one of the nozzles.

Referring to the drawings by letter, A denotes a casing, preferably rectangular in horizontal section, having a back wall a, a front a of less height than the back, sides a and a bottom a of curved form in transverse section. Secured to the back walla at its top is a hopper b, which in practice receives the material to be sized from any suitable supplier-as, for instance, the launder 0 shown.

The inner wall b of the hopper is movable, being provided at its ends with gudgeons 5 which have hearings in the casing sides, whereby the wall or what may be termed the gate 1) is capable of being turned on its pivots to regulate the passage of the material from the hopper into the casing. 12 b denote screw-threaded pins, each of which is pivotally secured at one end to the gate and is passed through a slot bin the opposite wall of the hopper, and b b are nuts which are screwed on the pins against the opposite sides of the hopper-wall to maintain the position of the gate. By reason of this structure the feed-opening from the hopper is capable of adjustment, the purpose of such adjustment being to regulate, control, and evenly spread or distribute the water and material which is to pass into the casing. The material coming from the hopper falls onto a screen (I, which is inclined from rear to front, whereby all of the particles not sufficiently fine to pass through said screen may quickly pass to a launder e at the front of the casing, from whence they maybe carried to another similar apparatus provided with a screen of coarser mesh to screen heavier particles. The smaller particles find their way through the screen-orifices, their passage being accelerated by means of water-jets which play from perforated pipes f against preferably the upper side of the screen and keep it from clogging. The pipes f, which preferably extend longitudinally of the casing, are connected at their ends to lateral pipes f, and said latter pipes are connected at their upper ends by a flexible coupling f to a watersupply pipe f whereby hinge-joints for the grid of pipes are provided to enable the grid to be raised to give access to the parts below it. In the bottom of the casingis a brush g, which in practice is continuously rotated through connection with a suitable source of power. The curvature of the bottom of the casing is concentric with the curvature of the brush, and the latter is mounted to bring its periphery close to, but out of contact with, the bottom.

The apparatus is, as before stated, designed more especially for use in connection with materials which contain valuable particles for concentration. To this end a number of openings are provided in the bottom a of the casing for the discharge of the sized and screened particles, to which openings are secured nozzles h h, adapted for tube connection with the concentrating apparatus. (Not shown.) By reference to Fig. 4, which illustrates in sectional view one of these nozzles, it will be observed that the aperture of the nozzle is slightly tapered throughout nearly its entire length, the internal diameter increasing slightly from the point or adjacent to the inlet or upper end, and between the point a: and the inleteopening h there is an abrupt tapering of the aperture, insuring free and rapid passage of the material and pre vention from clogging or choking the nozzle, the feed of the particles from the casing being thereby uninterrupted. The nozzles are each threaded at its upper end and screwed into a threaded opening in the bottom of the casing. The nozzle is thus longitudinally adjustable in the opening for the purpose of maintaining the inlet end of the nozzle in the path of the brush, and the sweeping action of the latter over the nozzle inlet-openings keeps said openings clear, so that the material at all times has a free outlet. The brush also operates to keep the particles in agitation.

In operation, the gate b being so adjusted as to deliver an even flow of water and material over the whole surface of the inclined screen, the material is fed into the hopper and, passing therefrom beneath the gate, falls on the inclined screen, the screenings finding their way into the casing and discharging through the nozzles and the unscreened par ticles tailing into the launder at the front. The screen is, as before stated, kept from clogging by the action of the water-jets, and

the combination of a casing having deliverythe discharge outlets and nozzles are kept open through the operation of the brush and the effect of the peculiar formation of the nozzle-apertu res. The screen may be replaced by one of a finer or coarser mesh, and thus the apparatus may be adjusted to screen particles of any given size. The screen may be given any inclination which will be found suitable to the work to be performed.

In practice a number of the above-described machines are used in association with each other, each machine deliveringits unscreened overflow into the next machine, which is provided with an inclined screen of suitably-increased mesh. Thus four to eight or more dilferent sizes of material are separated from each other and delivered automatically to sep arate concentrating apparatus. The brushes of the series of machines are rotated, preferably, at diiferent velocities, the speed of the successive brushes being increased as the mesh of the screen enlarges, the exception being that in the last machine of the series the rotation of the brush is relatively very slow.

I claim as my invention- 1. In an apparatus of the class described, a hopper having an inclined bottom, an inclined screen having its upper end contiguous to the hopper-bottom, a regulable gate forming a wall for the hopper, means for adjustably moving the gate to allow material and water to discharge from the hopper and distribute or spread over the screen, and a frame of waterjet pipes adjacent to the screen to discharge thereagainst said frame being movable in a vertical plane for the purpose specified.

2. In an apparatus of the class described, a casing having an inlet at its upper end and a plurality of discharge-outlets at its bottom, an inclined screen at the inlet, means for distributing material and water over the screen, and a rotatable brush arranged in said bottom to sweep the said outlets to clear them, said brush serving also as an agitator to keep the particles in motion.

3. In an apparatus of the class described, a casing having a rounded bottom in which are discharge-outlets, an inclined screen toward the upper end of the casing, a hopper above the screen having an adjustable dischargeopening, and a rotatable brush in the casing arranged to sweep the discharge-outlets to clear them said brush serving also as an agitator to keep the particles in motion.

4. In an apparatus of the class described, the combination of a casing having deliveryopenings in its bottom, a rotatable brush in the casing, and nozzles adjustable in the openings to maintain their inlet ends in contact with the brush, said nozzles each having an aperture slightly tapered toward its inlet end and abruptly tapered adjacent to said inlet end.

5. In an apparatus of the class described,

openings, a rotatable brushin the casing, and nozzles adjustable in the openings to bring their inlet ends into contact with the brush.

6. In an apparatus of the class described, the combination of a casing having deliveryopenings, a rotatable brush in the casin g, and nozzles adjustable in the openings to bring their inlet ends into contact with the brush the nozzles each having an aperture tapering toward its inlet end.

In testimony whereof I aflix my signature in presence of two witnesses.

THOMAS I ROWVLAND JORDAN.

Witnesses:

WM. A. TOPPING, EDW. F. A. VAUGHAN.

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